Techniques for fabricating and using arrays of violet-emitting LEDs coated with densely-packed-luminescent-material layers together with apparatus and method embodiments thereto are disclosed.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. An apparatus comprising: a submount; at least one LED die attached to the submount, wherein the perimeter of the LED die defines a plurality of sides; and a conformal coating over the plurality of sides to define a thickness on each of the sides, and comprising at least one luminescent material; wherein at least one of the LED die or the thickness of the conformal coating on the sides of the LED die is configured such that light emitted from each of the sides has a chromaticity with a Du′v′ that varies by no more than 0.015 from the Du′v′ of the light of the other sides.
A lighting device includes a base (submount) and at least one LED chip attached to it. The LED chip has multiple sides. A coating containing light-emitting material (luminescent material) covers these sides, with a specific thickness on each side. The LED chip or the coating thickness are designed to ensure the color of light emitted from each side is very similar, with color variations (Du′v′) of no more than 0.015. This ensures uniform light output.
2. The apparatus of claim 1 , wherein the thickness of the conformal coating varies among the plurality of sides.
Building upon the lighting device with an LED chip attached to a base (submount), where the LED chip has multiple sides covered by a conformal coating of light-emitting material (luminescent material) to ensure uniform light output from each side, the thickness of the conformal coating varies between the different sides of the LED chip. This variation in thickness is used to fine-tune the color of light emitted from each side.
3. The apparatus of claim 2 , wherein the plurality of sides comprises a top side and a plurality of lateral sides, wherein the thickness of the conformal coating on the lateral sides is thicker than the top side.
The lighting device with an LED chip attached to a base (submount) where the thickness of a conformal coating of light-emitting material (luminescent material) varies between the sides to ensure uniform light output, has a top side and multiple lateral (side) surfaces. The conformal coating on the lateral sides is thicker than the coating on the top side. This difference in thickness helps to direct more light outward from the sides.
4. The apparatus of claim 3 , wherein the thickness of the conformal coating varies among the lateral sides.
Considering the lighting device with an LED chip on a base (submount), where a conformal coating of light-emitting material (luminescent material) covers its top and side surfaces (where the coating is thicker on the sides than the top to direct light outward), the thickness of the conformal coating also varies *among* the lateral (side) surfaces of the LED chip. This variation in side thickness allows for more precise color and light distribution control.
5. The apparatus of claim 1 , wherein the LED die is a violet-emitting die.
The lighting device, which includes a base (submount), at least one LED chip attached to it, multiple sides on the LED chip covered by a conformal coating of light-emitting material (luminescent material) to ensure uniform light output from each side, uses a violet-emitting LED chip.
6. The apparatus of claim 5 , wherein the current density in the at least one LED die is 175 Amps/cm 2 .
The lighting device using a violet-emitting LED chip (mounted on a base and conformally coated with luminescent material for uniform light output) operates the LED chip at a high current density of 175 Amps per square centimeter. This increases the light output intensity.
7. The apparatus of claim 1 , wherein the at least one LED die comprises a first LED die and a second LED die having different spectra.
The lighting device with an LED chip on a base (submount), conformally coated with luminescent material, incorporates at least two LED chips. A first and second LED chip emit light with different spectra (colors). This allows for a broader or custom-tuned overall light spectrum.
8. The apparatus of claim 1 , further comprising reflective dam around the at least one LED die.
The lighting device with an LED chip attached to a base (submount), conformally coated with luminescent material for uniform light output, includes a reflective barrier (dam) surrounding the LED chip. This reflective dam helps to redirect light emitted from the sides of the chip upward, increasing light extraction efficiency.
9. The apparatus of claim 8 , wherein a portion of the conformal coating is between at least one of the plurality of sides and the reflective dam.
In the lighting device featuring a reflective dam around the LED chip (attached to a base and conformally coated with luminescent material) , a portion of the conformal coating is located between at least one side of the LED chip and the reflective dam. This ensures the conformal coating completely encloses the LED and also interacts with the reflective dam to manage light output.
10. The apparatus of claim 1 further comprising at least one optical element disposed over the at least one LED die.
The lighting device (LED chip on a base, conformally coated with luminescent material for uniform light output) also includes at least one optical element placed over the LED chip. This optical element further shapes and directs the light emitted by the LED.
11. The apparatus of claim 10 , wherein the at least one optical element is a lens.
The lighting device with an LED chip on a base, conformally coated, and featuring an optical element disposed over the LED chip, uses a lens as the optical element. This lens focuses or diffuses the light emitted from the LED.
12. The apparatus of claim 11 , wherein the lens is a silicone encapsulant.
The lighting device having a lens placed over the conformally coated LED (mounted on a base), wherein the lens is a silicone encapsulant. The silicone material provides protection and shapes the light.
13. The apparatus of claim 12 , wherein the silicone encapsulant is at least partially spherical.
In the lighting device using a silicone encapsulant as a lens over the conformally coated LED, the silicone encapsulant is at least partially spherical in shape. This spherical shape provides a specific light distribution pattern.
14. The apparatus of claim 1 , where the at least one LED die comprises at least a first LED die and a second LED die forming at least one linear array.
The lighting device, consisting of an LED chip on a base with luminescent coating to manage color uniformity, uses at least two LED chips (a first and a second) arranged to form at least one linear array. This linear arrangement enables a line of light emission.
15. The apparatus of claim 1 , wherein at least one face of the at least one LED die is aligned to be substantially parallel to a long edge of the submount.
In the lighting device with an LED chip attached to a base (submount), conformally coated with luminescent material, at least one face of the LED chip is aligned to be substantially parallel to a long edge of the submount. This specific alignment helps in the overall light distribution and packaging of the device.
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December 19, 2013
September 12, 2017
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